Chimney cap unit for extinguishing a starting chimney fire

Abstract

Chimney cap unit for extinguishing a starting chimney fire, comprising a part which greatly restricts the draught during the fire in the flue, and a part which regulates the outflow of the remaining flue gas stream through the normal flue, in such a way that after a chimney fire the throughflow aperture is partially restored, so that no counterflow, which could result in flue gases entering the living-room, can occur in the flue.

I claim: 
     
       1. Chimney cap unit including a chimney cap for extinguishing a starting chimney fire comprising: means for closing the passage during the chimney fire except for a restricted opening having first and second portions, said closing means being outside the flow of flue gases during normal operating conditions with no fire; and   means for controlling the passage of the flue gases through the first portion of the restricted opening in response to the temperature of the flue gases.   
     
     
       2. The chimney cap unit according to claim 1, further comprising means for removing said closing means and controlling means from the chimney cap such that said closing means and controlling means remain in the same position relative to one another.